Electric motor.



110 797396. PATENTED AUG. 15, 1905.

' R. E. BARKER.

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UNITED STATES PATENT OFFICE.

RALPH E. BARKER, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

ELECTRIC MOTOR.

Specification of Letters Patent.

Patented Aug. 15, 1905.

Application filed October 26,1903. Serial No. 178,508.

To all, whom, it may concern.-

Be it known that I, RALPH E. BARKER, a citizen of the United States,residing at Lynn, in the county of Essex and State of Massachusetts,have invented certain new and useful Improvements in Electric Motors, ofwhich the following is a specification.

This invention relates to the construction of dynamo-electric machines,and more particularly to small electric motors, such as those used todrive fans, in which simplicity and compactness are features of primaryimportance. In the design of these small motors special attention isgiven to reducing the size and number of the parts as much as possiblefor a given output and arranging these parts to occupy a minimum space.In working toward these ends some difiiculty has been experienced inproperly securing the field-coils in place. It has been found that thecoils sag and change their shape after considerable use, and unless somemeans is adopted for preventing or at least limiting this sagging aportion of the coil not properly secured against movement may sag untilit rubs against the armature, causing undue friction and resultingdisastrously unless stopped immediately. It is therefore highlynecessary that the coils be so secured that movement to a position ofdanger to the coils themselves or to the other parts of the motor ispositively prevented. For this purpose I have provided adjustablecoil-supporting devices for the several field-coils having holdingmembers which extend around the coils and are held at one end by thepole-pieces and at the other end by tie-rods on which the holdingmembers can be adjusted. By this construction the coils may be drawntightly back on the pole-pieces and closely in around them and heldsecurely in position.

The novel features of my invention will be definitely indicated in theappended claims.

The details of construction will be better understood by reference tothe accompanying drawings, which show one embodiment of my invention,and in which Figure 1 is a top view of a motor equipped with myimprovements. Fig. 2 is an elevation of the same broken away andsectioned in part, and Fig. 3 is a perspective view of thecoil-supporting device.

In the drawings I have shown my improvements as applied to a ceilingfan-motor, but it must be understood that the improvements are equallyapplicable to motors and generators of any description.

1 indicates the pole-pieces, which are cast integral with the shell 2,which forms the frame of the motor and which has the form of a cylinderdrawn in on opposite sides at the pole-pieces. Secured to the top andbottom of the cylindrical shell 2 by bolts 3 3 are the end shields 4 4,each of which is a curved arm extending across the end of the shell andprovided with a central opening forming a bearing for the shaft 5, whichcarries the armature 6, the commutator, and the fanblades. The upper endshield at is formed with projections 7 7, on which are mounted the brushholders carrying brushes bearing on the commutator. The field-coils 8 8fit over the pole-pieces, as shown in the drawings. Each coil isprovided with two coil-holders 1O 10, each of which extends around thecoil at the middle of one side, as shown in the drawings, and is bentover at one end against the back of the pole-piece or into an openingtherein. The other ends of the holders 1O 10 extend back and are tiedtogether by a tie-rod 9, extending through openings in the ends of thecoil-holders and threaded to receive nuts 11 11, by which the holdersare positioned on the rod. The coil-holding members 10 10 are formedfrom flat metallic strips, and the part in contact with the coilconforms to its shape to prevent damaging the coil. It will be seen thatby this construction tightening up the nuts 11 11 and thus moving theends of holders 1O 10 toward each other on rod 9 draws the field-coils 88 back on the pole-pieces and also close in around them, and that whenonce adjusted the coils will be held firmly in the desired position. Acasing 12 of ornamental design incloses the motor and is secured to theshell 2.

I do not wish to be understood as limited to the precise constructionshown, as many modifications can be made therein without departing fromthe spirit of my invention, and all such modifications I consider withinthe scope of my invention.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. In a dynamo-electric machine, a polepiece, a coil thereon, and meansengaging with portions of the coil for adjusting it to conform to theshape of the pole-piece and holding it in its adjusted position.

2. In a dynamo-electric machine, a polepiece, a coil thereon, and meansfor drawing the coil in around the pole-piece and a portion thereof backon the pole-pieces.

3. In a dynamo-electric machine,pole-pieces, coils thereon, and meansfor drawing the middle portions of the coils back on the pole-pieces.

4. In a dynamo-electric machine, a polepiece, a coil thereon, and meansfor securing the coil on the pole-piece, comprising a coilholding memberengaging the coil and braced on the pole-piece.

5. In a dynamo-electric machine, a polepiece, a coil thereon, and anadjustable coilsupporting device comprising a support and a coil-holdingmember engaging the coil and adjustably mounted on the support.

6. In a dynamo-electric machine, a polepiece, a coil thereon, and acoil-supportingde- Vice comprising a support and a coil-holding membermounted at one end on the support, braced at the other end on thepole-piece and engaging the coil between its ends.

7. In a dynamo-electric machine, a polepiece, a coil thereon, a shaft, arod parallel thereto, and coil-holding members engaging the coil,mounted on said rod near its ends and braced on the pole-piece.

8. In a dynamo-electric machine, a polepiece, a coil thereon, a shaft, arod parallel to the shaft, coil-holding members engaging the coil,loosely mounted on the rod near its ends and braced on the pole-piece,and means for adjusting said coil-holding members on the rod.

9. In a dynamo-electric machine, a polepiece, a coil thereon, a shaft, arod back of the pole-piece and parallel to the shaft, coil- DUGALD McK.McKiLLor, HENRY O. VVESTENDARP.

